Exact(60)
The decalcification solution was changed daily.
The acidic solution was changed every 3 h.
Twice a week, the lipase solution was changed.
A naked-eye sensitive fluorescent green color of solution was changed to blue.
The naked-eye sensitive color of the solution was changed from a fluorescent green to blue.
The nutrient solution was changed once per week and its pH adjusted to 5.3 5.5 daily.
The NaOH solution was changed daily during the first week and weekly thereafter.
Colour of the solution was changed gradually from colourless to yellow to red to green.
P deficiency treatment lasted for 30 d, during which the solution was changed every other day.
The color of the solution was changed to black and then brown.
Finally, the extracellular solution was changed back to the Ca2+- and Na+-free solution with BHQ.
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